Brake-shoe.



HIE. BULLOCK.

BRAKE SHOE.

APPLICATION FILED JULY 22. 1915.

LMQQH I Patented Nov. 16, 1915.

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HENRY E. BULLOCK, OF CHICAGO, ILLINOIS, ASSIGNOR TO ILLINOIS MALLEABLE IRON COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

BRAKE-SHOE.

To all whom it may concern: 4

Be it known that I, HENRY E, BULLOCK, a subject of the King of Great Britain, and

resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Im rovements in Brake- Shoes; and I do here declare that the following description of my invention, taken in, connection with the accompanying sheet of drawings, forms a full, clear, and exact specification, which will enable others skilled in the art to which my said invention appertains to make and use the same.

This invention has general reference to brake shoes; and it is especially directed to improvements therein whereby a more serviceable and efficient brake shoe is produced without increasing the cost thereof.

My invention, therefore, consists, essentially, in the novel and peculiar construction and arrangement of parts as hereinafter first fully set forth and described, and then pointed out in the claims.

In the drawings already referred to, which illustrate the preferred embodiment, as well as modifications of, my invention, Figure 1 is a side elevation of my improved brake shoe. Fig. 2 is a similar view of a-brakeshoe reinforced at the flank thereof, aportion being broken away to show afsectional view of the same. Flg. 3, is an lnyerted plan of said brake shoe. Fig. 4 is a slmllar view showing the grooves, recesses or passages .therethrough arranged obliquely, or at an angle to the flanks of the shoe. Fig. 5 is a similar view showing the shoe provided with reinforcing plates at the flanks thereof. Fig. 6 is an inverted plan of a shoe showing the grooves, recesses and parsages closed at the flanks of the shoe. Fi 7 is a transverse sectional view on line 7- 7 of Fig. 1. Fig. 8 is a like view on line 88 of Fig. 5, and Fig. 9 is a fragmental view of the shoe illustrating a method of producing the passages, recesses and grooves in the shoe in the process of casting.

Like parts are designated by the same characters and symbols of reference in all the various figures. o

It is awell known fact that brake shoes having a continuous wearing face, are liable to glaze, z. c. the wearing surfaces become so smooth as'to seriously impair their brakng efficiency. It is also well known that when the brake shoes are applied to retard Specification of Letters Patent.

Patented Nov. 16, 1915..

Application filed July 22, 1915; Serial No. 41,303.

or arrest the movement of a train, they will rapidly heat, ther'eby causing the shoes to be 1 more quickly worn, without having any noticeable effect on the efliciency of the same. To overcome these defects in, and the objections to, most of the brake shoes now in use, which is the main object of my present invention, I form, in the face or wearing surface 12, of a brake shoe, a series of transthe car wheels; and finally, they serve the purpose of ventilatingthe brake-shoe by permitting a current or currents of air to pass through the brake shoe and thereby to cool the same. And in order that there be at all times a series of these grooves available as the shoe is worn thinner, I provide the shoe with a series of transverse cavities or. openings, 14:, preferably in rows concentric to the curvature of the wearing surface of the shoe; and to locate these series of rows of apertures so close together that when the grooves 13 begin to disappear owing to the wearing away of the shoe, a-

new series of such grooves will begin to appear in the face'of the shoe, by the opening of the transverse passages 14, so that these grooves continue to be available until the shoe is worn to such an extent as to be of no further use.

As hereinbefore stated, the transverse contour of the grooves 13 and transverse passagesor cavities 14 is immaterial; and in Fig. 1, I have shown these grooves in circular, and in Fig. 2, in angular or poly onal contour. And as to the disposition of these grooves and transverse passages, with reference to the flanks of the shoe, I may state that they may be either at right angles to these flanks, as shown in Fig. 3, or at an oblique angle't'o these flanks, as illustrated in Figs. 4, 5 and 6. While either of these dispositions is effective I prefer the used, without the slightest change or modification, and I desire it to be distinctly understood that I do not confine myself to any particular design or style of brake shoe, the design .shown being simply an exemplification of my invention.

It is also obvious that where in my improved brake shoe the recesses and passages are open at the flanks of the shoe, these passages can be readily produced by the insertion of cores inthe mold, which cores are supported by core-prints in the well-known manner. But where these recesses and passages or cavity in the shoe are closed at the;

flanks of the shoe, the'method of producing the cavities is best carried out by connecting these cavities by means of passages starting from the wearing surface of the shoe, and to exemplify one such method, I show in Fig. 9 a fragment of a brake shoe wherein 20 designates a core for one of the transverse recesses or grooves in the wearing surface of the shoe. This core has a bridge 21, to connect the core 20vto a core 22, for producing one of the series of cavities 2, and this "latter core 22 has a bridge, 23, connecting the core 22 to afurther core'24, for producing thenext of the series of cavities in thefshoe These cores will support themselves in a mold and maybe further. supported by the employment of chaplets, in amanner readily understood by'perso'ns versed in the art of founding and casting, Of course, other methods of producing the cavities in the body of the shoe may be resorted to, as for instance, the transverse passages in the shoe shown in Fig. 2, may be plugged at the terminals, as shown at 25 in Fig. 6, or these transverse passages in the shoe may be closed by applying to the flanks of the shoe, plates 26, as illustrated in Fig. 8, all of which methods, an'd'others that will readily suggest themselves to persons skilled in the art to which my invention appertains, may be resorted to to effect the object in View of producing cavities in the shoe in the process of casting; and finally, these cavities may be produced in a shoe cast without the same, by drilling of the holes, (or not as the case may be) as heretofore described.

The plates 26 may be secured to the'flanks the same and plugging the ends in any desired manner, as for instance by studs, 2'7, as shown in Figs. 2, and 8, and thus serve as reinforces to the shoe, to hold the shoe together should it in course of wear,

crack, as is frequently the case when the shoe becomes rather thin from wear. 1

Having thus fully described thisinvention, I claim as new, and desire to secure to myself by Letters Patent of the United States- 1. As an improved article of manufacture a brake-shoe, there being in the wearing surface of said shoe a series of ventilating grooves and transversely through the body of said shoe and substantially parallel to the wearing face thereof, a series of openings or passages.

2: As an improved article of manufac ture, a brake shoe, said brake shoe having in its wearing face a series of ventilating grooves, and transversely through said shoe :1 series of ventilating passages, said passages being substantially parallel to the wearing face of the shoe, the bottom of said grooves and the lower edge of saidpassages being in substantial alinement with reference to the wearing face of said shoe.

3. As an improved article of manufacture,

' a brake-shoe, said brake shoe having in its posed with reference to the flanks of the,

shoe, said cavities being substantially parallel to. the wearing face of the shoe, said cavities being constructed to afford recesses when the shoe is worn to an extent to dis-- close and open the said cavities.

5. A brake shoe, saidbrake shoe having in its wearing face a series of transverse grooves and transversely through the shoe one or more series of apertures, open at the flanks of said shoe, said grooves and said apertures being connected by passages, the lowermost edges of the transverse apertures being slightly below the uppermost edges of said transverse grooves, so that when the saidgrooves approach disappearance by the wearing of the shoe, the said transverse apertures will begin to show in the wearing face of the shoe and constitute transverse grooves therein.

HENRY E. BULLOCK. 

